In case anyone wants to experience Just Intonation major and minor thirds, you can do it easily on any standard guitar or bass.

First learn where the 4th, 5th and 6th harmonic points are on a string and practice touch-and-release at these points to get clear, long-ringing harmonics. Use a clean and bright guitar tone and use a pick with above average force. You can websearch for more detailed help with the technique needed to do this.

Warning: there are a lot of misleading, confusing, overcomplex and inaccurate diagrams on the internet for these positions, i'm looking for a good one. But roughly:
4th harmonic: fret 5
5th harmonic: fret 3.9
6th harmonic fret 3.2
(7th harmonic: fret 2.7)

JI major third:

> Tune a pair of adjacent open strings to a standard major third interval, best to tune up the lower by a semitone.
> With your fretting hand, hold one finger at the 5th harmonic point and another finger at the 4th harmonic point and hold this position while you touch-and-release, this will help you play the harmonics quickly in succession.
> Play the 5th harmonic of the lower string then immediately after play the 4th harmonic of the higher, let these ring together and listen, you will hear 2 almost identical pitches.
> Do the same again several times while slightly detuning the higher string to get these 2 harmonics precisely in tune with each other.
> Then play both open strings to play the JI major third.

JI minor third:

> Tune a pair of adjacent open strings to a standard minor third interval, best to tune up the lower by a semitone and detune the higher by a semitone.
> Then continue as before but tune the 5th harmonic of the higher string to the 6th harmonic of the lower by slightly uptuning the higher string.

Being used to 12ET you may find these sound slightly 'out of tune' due to conditioning but also certainly 'more in tune'.

The JI major third is 3.86 semitones, so the 12ET version is 14 cents (roughly 1/6th of a semitone) sharp.
The JI minor third is 3.16 semitones, so the 12ET version is 16 cents (roughly 1/6th of a semitone) flat.

Brutal microtonal metal! LOL! IDK. Feels like people are reaching. This is kinda interesting:

Microtonal to me sounds out of tunal. But why the hell not? Do something with your music! wonder how this stuff is notated. hhm.

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Sounds very nice to me... I've been following Tolgahan for some time, though.

What I don't understand, though, is...well, metal music is supposed to always be reaching, isn't it? A lot of reviews I've received in press mention this idea that microtonal + metal = incompatible. I don't understand that logic. Oh well.

Sounds very nice to me... I've been following Tolgahan for some time, though.

What I don't understand, though, is...well, metal music is supposed to always be reaching, isn't it? A lot of reviews I've received in press mention this idea that microtonal + metal = incompatible. I don't understand that logic. Oh well.

Click to expand...

Well, I said, "...why the hell not? Do something with your music!" I thought I was being encouraging there.

I truly love some of the chords of 22EDO. And Brendan is really good at exploring this system, his first Etude was awesome, and this one is great too, and his band Ilevens play some really cool psych rock!